Columbia MCB-50J Operations Instructions

P/N 240009038, Rev. B [04/2012]MCB SERIES IICast Iron Gas Fired Boilers For Forced Hot WaterINSTALLATION, OPERATION & MAINTENANCE MANUALModels MC

104 - CONNECTING SUPPLY AND RETURN PIPINGFigure 6 - Single Zone System With DHWFigure 7 - Multi Zone System With Circulators And DHW

114 - CONNECTING SUPPLY AND RETURN PIPINGFigure 8 - Multi Zone System With Zone Valves And DHW (With Circulator)Figure 9 - Multi Zone System With Zone

12When an existing boiler is removed from a common venting system, the system is likely to be too large for the proper venting of the appliances sill

131. Verify only boiler is serviced by Vent Damper. Figure 11.2. Clearance of not less than 6 inches (152mm) between Vent Damper and combustible mater

148 - CONNECTING GAS SERVICEGeneral• Use piping materials and joining methods acceptable to authority having jurisdiction. In absence of such require

159 - ELECTRICAL SECTIONELECTRICAL WIRINGSee wiring diagrams on the following two pages for details.Electrically bond boiler to ground in accordance w

1610 - WIRING DIAGRAM Figure 13 - Integrated High Limit Electronic Ignition Control (240008781) WARNINGModifi cation, substitution or elimination of f

1711 - LIGHTING INSTRUCTIONSLIGHTING PROCEDURE FOR BOILER WITH INTERMITTENT PILOT SYSTEMA. This appliance is equipped with an ignition device which a

1812 - NORMAL SEQUENCE OF OPERATION13 - GENERAL INSTRUCTIONSThermostat actuates on call for heat, completing circuit to control. Completed circuit to

1913 - GENERAL INSTRUCTIONSFigure 18 - Gas Burner FlameFigure 20 - Gas Burner PilotFigure 19 - Combustion ChamberBURNERSORIFICESGAS VALVE• Make visual

2Table 1 - DimensionsBoiler No.Natural Gas Inlet*DimensionsPump size Supply & Return TappingsABCDEF50 ½" 11⅛"5½" 4" 30¾"

20• Adjust gas input to boiler by removing protective cap on pressure regulator, and turning screw clockwise to increase input and counterclockwise

2115 - CONTROL FUNCTION1 HI TEMP illuminates when boiler water temperature reaches high limit setting and remains lit until water temperature falls 10

NOTES

Date Service Performed Company Name & Tech Initials Company Address & Phone #

COLUMBIA BOILER COMPANYMain offi ces and factoryPittstown, PA

3Safety Symbols & WarningsThe following defi ned symbols are used throughout this manual to notify the reader of potential hazards of varying risk

4 Table 2 - Ratings and CapacitiesBoilerNo.(1) Input Mbh(1)Heating Capacity Mbh(2) Net AHRI Rating Water Mbh AFUENo.ofBurners(3)RecommendedA

51. Installation must conform to the requirements of the authority having jurisdiction or, in the absence of such requirements, to the National Fuel G

63 - VENTILATION & COMBUSTION AIRProvide combustion air and ventilation air in accordance with the section “Air for Combustion and Ventilation,” o

74 - CONNECTING SUPPLY AND RETURN PIPINGCheck local codes for maximum distance from fl oor or allowable safe point of discharge.RELIEF VALVEDISCHARGE L

8Circulators in following illustrations are mounted on system supply side, mounting on system return side is also accept-able practice.1. Boiler used

9BOILERWATER INLETALTERNATECIRCULATORLOCATIONTO SYSTEMFROM SYSTEMCIRCULATORSHUT-OFFVALVEPRESSUREREDUCER VALVECHECK VALVEBALL VALVE3 WAY MIXINGVALVEAIR